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[2] See S. Wolfram, ''Computer software in science and mathematics'', Sci. Amer. 251 (September 1984) 188. For information on cellular automata, see S. Wolfram, ''Cellular automata as models of complexity'', Nature 311 (1984) 419. For more technical discussion of computation theory applied to physics, see S. Wolfram, ''Undecidability and intractability in theoretical physics'', Phys. Rev. Lett. 54(1985) 735; S. Wolfram, ''Origins of randomness in physical systems'', Phys. Rev. Lett., to be published.